Abstract: Taking Xiaozhuang Coal Mine in Shaanxi Province as the research background, Using research methods that combine numerical simulation with on-site measurement, Analyze the influence scope of deep mining of extremely thick coal seams and its impact on adjacent roadways. research shows: In the deep-buried and extremely thick coal seam, the supporting pressure in front of the working face reaches 60m, and the stress increasing zone appears at 5~17m. Support stress at the side of working face appears stress increase zone at 7~13m;After the impact of mining, the plastic zone near the roadway is asymmetrically distributed.The destruction of surrounding rock near the working face is greater than the destruction of surrounding rock on the far side. The research results can provide guidance for roadway support and coal seam mining under similar circumstances.